Windows Host to WSL proxy

portForward.js

#!/usr/bin/env node
const { execSync } = require('child_process');
const CMD = process.argv[2];
const PORT = process.argv[3];
const IP = execSync('ifconfig eth0').toString().split(/[\r\n]+/)
  .filter(line => line.match(/inet /))[0].split(/ +/)
  .filter(token => token)[1];

function usage () {
  console.log(`
${process.argv[1]} <add|del|show> [port]
  add port: add portproxy.
  del port: delete portproxy.
  show:     show portproxy.
`);
  process.exit(1);
}

function runAsUAC (cmd) {
  execSync(`powershell.exe -noprofile -noninteractive -command "Start-Process powershell.exe -Verb RunAs -ArgumentList '${cmd}'"`);
}

function forwardingPorts () {
  return execSync('netsh.exe interface portproxy show v4tov4').toString()
    .split(/[\r\n]+/)
    .map(line => line.split(/ +/).filter(token => token)[1])
    .filter(port => parseInt(port));
}

switch (CMD) {
  case 'try':
    if (!PORT) usage();
    if (!forwardingPorts().includes(PORT)) {
      runAsUAC(`netsh.exe interface portproxy add v4tov4 listenport=${PORT} listenaddress=0.0.0.0 connectport=${PORT} connectaddress=${IP}`);
    }
    break;
  case 'add':
    if (!PORT) usage();
    runAsUAC(`netsh.exe interface portproxy add v4tov4 listenport=${PORT} listenaddress=0.0.0.0 connectport=${PORT} connectaddress=${IP}`);
    break;
  case 'del':
    if (!PORT) usage();
    runAsUAC(`netsh.exe interface portproxy delete v4tov4 listenport=${PORT} listenaddress=0.0.0.0`);
    break;
  case 'show':
    console.log(execSync('netsh.exe interface portproxy show v4tov4').toString());
    break;
  default:
    usage();
    break;
}